HS code: 7304519001

Alloy steel seamless steel tubes for pressure and high temperature (≥ 62MPa, tensile strength, yield strength ≥ 44MPa) (chemical composition diameter ≥ 127mm, (wt%) .7 ≤ C ≤ .13, 8.5 ≤ Cr ≤ 9.5, .3 ≤ Mo ≤ .6, 1.5 ≤ W ≤ 2, cold drawn or cold rolled,

高温承压用合金钢无缝钢管(抗拉强度≥620MPa、屈服强度≥440MPa)(外径在127mm以上(含127mm)，化学成分(wt%)中碳(C)的含量≥0.07且≤0.13、铬(Cr)的含量≥8.5且≤9.5、钼(Mo)的含量≥0.3且≤0.6、钨(W)的含量≥1.5且≤2.0、抗拉强度≥620Mpa、屈服强度≥440Mpa);